Sliding door construction and means for storing same



Aug. 20, 1968 J. E. HUNT ETAL 3,397,487

SLIDING 000R CONSTRUCTION AND MEANS FOR STORING slum Original Filed Nov. 18, 1965 2 Sheets-Sheet 1 R. FIORE M9 INVENTORS. JOHN E. HUNT MICHAEL ATTORNEYS Aug. 20, 1968 J. E. HUNT ET AL 3,397,487

SLIDING DOOR CONSTRUCTION AND MEANS FOR STORING SAME Original Filed Nov. 18, 1965 '2 Sheets-Sheet? INVENTORS.

JOHN E. HUNT MICHAEL R. FIORE ATTORNEYS United States Patent O 3,397,487 SLIDING DOOR CONSTRUCTION AND MEANS FOR STORING SAME John E. Hunt, Norwood', Mass., and Michael R. Fiore, Warwick, R.I., assignors to The Alumiline Corporation, Pawtucket, R.I., a corporation of New York Continuation of application Ser. No. 508,504, Nov. 18, 1965. This application Mar. 28, 1967, Ser. No. 626,632 5 Claims. (Cl. 49130) ABSTRACT OF THE DISCLOSURE A sliding door construction that is movable in upper and lower track assemblies and that includes vertically adjustable guide members that are receivable in said track assemblies, the door construction being movable in said track assemblies from an entrance opening to a storage position.

This application is a continuation application of application Ser. No. 508,504, filed Nov. 18, 1965, now abandoned.

The present invention relates to sliding door constructions and means for storing same. More particularly, the present invention relates to a door assembly that includes a plurality of doors that are adapted to be located in coplanar relation across an entrance opening and are movable on a single track to a storage position, wherein the doors are disposed in spaced, parallel relation.

The present invention has particular application in entrance constructions wherein a plurality of doors are employed to define a closure for the entrance opening. In this type of entrance construction, all of the doors are movable to either side of the entrance opening to provide a relatively large entrance area through which customer traffic flows. In this type of entrance construction, which is used primarily in commercial installations, it has been the practice heretofore to mount the various doors on separate tracks that were located either in the floor or in an upper header or support, the separate tracks being required for storage of the doors when the entrance area was open to customer trafiic. The present invention is unique in that it provides a plurality of doors that in the closed position thereof are located in a single plane and that appear to define a fixed wall. One of the features of the invention is the vertical adjustment of the door guide members that are located in the upper and lower ends of the doors and that are receivable in the tracks in which the doors are moved. Adjustment of the guide members is accomplished by locating threaded bushings in the vertical stiles and providing access to the bushings through openings formed in the stiles.

Accordingly, it is an object of the present invention to provide a sliding door assembly which includes a plurality of doors that in the closed position thereof are disposed in a single plane.

Another object of the invention is to provide track assemblies that are easily mountable in the floor and an upper support of the installation in which the door assembly of the present invention is located, the track assemblies including grooved tracks that receive tensioned guide tabs and rollers that are mounted in the four corners of the individual doors of the door assembly.

Still another object is to provide track assemblies for use in a sliding door assembly that includes switch sections that provide for movement of the individual doors from a single plane position to a storage position, wherein the doors are disposed in spaced, parallel relation.

Still another object is to provide a door for use in a door assembly that includes vertical members in which tensioned guide members are mounted in the upper and ice lower ends thereof, the guide members being received in grooved track sections and being located in the vertical members in offset relation with respect to the leading and trailing ends of the door.

Still another object is to provide a switch member for use in a sliding door track assembly that includes upper and lower grooved tracks for receiving upper and lower leading and trailing edge guides, respectively, both the upper and lower guides being placed under spring tension to provide for tensioned control of the door at the top thereof.

Still another object is to provide a sliding door assembly wherein a plurality of doors are located in a single plane and are adapted to roll on spring urged rollers on upper and lower single track assemblies that are provided with spaced grooves for guiding the doors during the movement thereof.

Still another object is to provide upper and lower tensioned guide members for a sliding door that are axially rotatable so as to provide for movement of the doors on curved switch sections of the track assemblies as the doors are moved from the position of use to an Open or storage position.

Still another object is to provide upper and lower switch sections in a sliding door assembly both of which include curved tracks for guiding the sliding door to and from a storage area.

Still another object is to provide spring roller guides for the top and bottom ends of a sliding door, both the top and bottom roller guides being under constant tension to provide tensioned control at the top of the door.

Still another object is to provide switch sections in a sliding door track assembly that include surved tail tracks that are defined at least a 60 angle of curvature so as to permit storage of the door in an upright position and without the requirement of mechanical linkages or attach ments.

Still another object is to provide a sliding door having roller guides at both top and bottom corners thereof so as to provide four corner control of the door.

Other objects, features and advantages of the invention will become apparent as the description thereof proceeds whn considered in connection with the accompanying illustrative drawings.

In the drawings which illustrate the best mode presently contemplated for carrying out the present invention:

FIG. 1 is a perspective view of an entrance construction showing a pair of doors of the sliding door assembly of the present invention located in the position of use and further showing a plurality of the sliding doors located in a storage position;

FIG. 2 is a fragmentary section view of a corner of one of the door constructions embodied in the present invention illustrating the upper and lower corner clip and guide assemblies associates therewith;

FIG. 3 is an enlarged sectional view with parts shown in elevation of the lower clip and guide assembly illustrated in FIG. 2 and further showing the location of the clip and guide assembly with respect to a track section on which the guide member thereof is mounted;

FIG. 4 is a top plan view of one form of a switch section that is utilized with the track assembly of the present invention and that is employed for storing the doors in parallel located with respect to the position of use; and

FIG. 5 is a top plan view showing another form of track section and switch section communicating therewith that provides for storage of the doors at right angles with respect to the position of use.

Referring now to the drawings and particularly to FIG. 1, a plurality of doors that define the sliding door assembly of the present invention are illustrated, each of 3 the doors being generally indicated at 10. As shown in FIG. 1, the doors that define the sliding door assembly are mounted in an entrance between a top track assembly generally indicated at 12 and a bottom track assembly generally indicated at 14. As will be described, the top and bottom track assemblies 12 and 14 are formed so as to receive the doors 10 therebetween in a single plane in the position of use, thereby imparting a fixed wall appearance to the assembly. The track assemblies 12 and 14, as will be described, are defined by a plurality of track sections that include switch sections which provide for movement of the sliding doors 10 from the position of use to an open or storage position.

The sliding doors 10 that define the sliding door assemblies are generally conventional in construction with respect to the frame portions thereof and include vertical stiles or members 16 and18 to which are joined a bottom rail member 20, a top rail member 22, and an intermediate rail member 24. Glazing 26 and 28 is fixed between the vertical and horizontal members in the conventional manner. Although not illustrated, the leading and trailing edges of the doors 10 are formed in a particular manner so as to provide meeting stiles. This constructional arrangement of the meeting stiles or vertical rail members insures that the door assemblies in the closed position thereof are sealed against weather and are theft proof. It is understood, of course, that suitable weatherstripping, such as felting, is secured in the edges of the vertical members of the doors 10 in accordancewith the conventional requirements.

In order to secure the vertical and horizontal members of each door together and to further guide the doors 10 on the track assemblies 12 and 14, a lower clip and guide assembly generally indicated at 30 and an upper clip and guide assembly generally indicated at 32 are mounted in each of the vertical members 16 and 18 of the doors for securement to the lower and upper rail members and 22.

The lower and upper clip and guide assemblies and 32 are formed substantially alike, and, as shown in FIGS. 2 and 3, the guide assembly 38 includes a clip portion generally indicated at 34 that is defined by a lower portion 36, an upper portion 38, and a vertically extending web 40 that interconnects the lower and upper portions 36 and 38. Formed as an integral part of the lower portion 36 of the clip portion 34 and extending outwardly in a horizontal direction therefrom is a leg 42 that is welded directly to an interior web 44 of the lower rail member 20. The upper portion 38 of the clip portion 34 has a downwardly extending leg 46 joined thereto to which a horizontal extension 48 is joined. The extension 48 is welded to the underside of an upper wall 50 of the horizontal rail member 29 and cooperates with the leg 42 to secure the vertical member 18 to the horizontal rail member 20.

Formed interiorly of the bottom portion 36 of the clip portion 34 is a threaded opening in which a bushing 52 having exterior threads formed thereon is received. An opening 53 is formed in the bottom portion 36 and provides access to a slot 54 that is used to adjust the vertical position of the bushing 52 in the clip portion 34. A guide member 55 defined by a body 56 and spaced ears 57 and 58 is adapted to be mounted in the bushing 52 for rotation with respect thereto and for this purpose includes a shaft 59 that extends through the bushing 52 and projects above the upper end of the lower portion 36. A cotter pin 60 extends through the shaft 59 and engages the upper end of the bushing 52 and is designed to retain the shaft 59 in position in the bushing 52, it being understood that the guide member 55 is mounted for rotation with the shaft 59 in the bushing 52 that is vertically adjustable in the clip portion. Upward movement of the guide member 55 and shaft 59 is resisted by a spring 62 that is mounted on a pin 64 secured to the top of the shaft 59 and that extends into a hole 66 formed in the underside of the upper portion 38 of the clip portion 34. It is seen that the spring 62 urges the guide member 55 outwardly thereby providing for tensioned control thereof.

As illustrated in FIG. 3, a roller 68 is mounted for rotation on a pin '70 between the ears 57, 58 of the guide member 55, and, as will be described, the roller 68 is adapted to engage a portion of the track assembly 14 for supporting the door 10 for rolling movement thereon. As further shown in FIG. 3, the ear 57 of the guide member 55 is formed with an extension that defines a guide tab 72 which, as will be described, extends into a grooved track of the track assembly 14 and thus defines a guide for the door 10 during the rolling movement thereof. As illustrated in FIGS. 2 and 3, the guide tab 72 is located at the bottommost end of the vertical member 18, and in movement of the door to a storage position (see FIG. 1), the vertical member 18 defines the trailing end of the door 10 with respect to the movement thereof. Thus, during movement of the door 10 to the storage position, the guide tab 72 would be located on the right rear edge of the door 10 as seen in FIG. 1. A corresponding guide tab 74 is formed as part of a guide member located at the lower end of the vertical member 16, it being understood that during movement of the door 10 to a storage position, as seen in FIG. 1, the guide tab 74 will be located on the leading end of the door 10 and thus is disposed on the front left side thereof. This positioning of the guide tabs 72 and 74 is illustrated in FIG. 3, and the purpose thereof will be more fully described hereinafter. It is understood that the actual construction of the guide members as mounted in the lower ends of the vertical members 16 and 18 is substantially identical, the guide tabs 72 and 74 being positioned by rotating each guide member 55 with respect to its clip portion 34. It is further seen that the roller 68 and guides '72 or 74 are urged outwardly under control of spring 62 and are thus urged into engagement with the adjacent track assembly.

The vertical members 16 and 18 are secured to the upper rail members 22 in substantially the same manner as that described above in connection with the securement of the vertical members to the lower rail member 20. Thus, as illustrated in FIG. 2, the upper clip and guide assembly includes an upper clip portion generally indicated at 76 that is located within the upper end of the vertical member 18. The upper clip portion 76 is defined by an upper portion 78, a lower portion 80 and an intermediate web portion 82. An extension 84 is joined to the upper portion 78 and is welded to the horizontal rail member 22 while the lower portion 80 and an extension 85 projecting upwardly therefrom are welded to the vertical member 18. A tubular portion 86 is secured to the extension 84 and is also welded to an interior web 87 of the rail member 22. Mounted for rotation within the clip portion 76 is a guide member generally indicated at 88 that is defined by a body portion 89 and opposed ears 90. A shaft 91 extends through a bushing 92 that is mounted within the upper portion 78 of the clip portion 76 and projects downwardly therefrom, being secured in the clip portion 76 by a cotter pin 94. A spring 96 is mounted on a pin 98 that is fixed to the shaft 91 and extends into a hole 180 formed in the lower portion 80 of the clip portion 76, the spring 96 maintaining the guide member 88 under tension. A roller 102 is mounted between the ears on a pin 104 and is engageable on a portion of the upper track assembly 12 for rolling movement thereon. A guide tab 106 is formed as an extension of one of the ears 89 and projects into a grooved track in the track assembly 12 for guiding the movement of the door 10 during the transferring movement thereof. It is seen that the guide tab 106 is located in corresponding relation in the vertical member 18 to the guide tab 72, and, thus, during movement of the door 10 to the storage position wherein the vertical rail 18 defines the trailing end of the door, the guide tab 186 is located on the right rear end thereof. A corresponding guide tab 106 is formed as part of a giude member that is located in the upper end of the vertical member 16 and is positioned oppositely to the guide tab 106. Thus, when the door is moved to the storage position, the guide tab 106 in the upper end of the vertical member 16 is located on the left forward end of the door. If vertical adjustment of the guide members is required, the bushing 52 may be rotated, access to the bushing 52 being provided through the opening 53 and through an opening formed in the lower ends of the vertical members 16 and 18 that is covered by a plate 107 as seen in FIG. 1.

As previously described, the doors 10 are mounted between an upper track assembly 12 and a lower track assembly 14 for sliding movement therebetween. Referring now to FIGS. 3, 4 and 5, the lower track assembly 14 is illustrated, it being understood that the upper track assembly 12 is constructed and formed similarly. Since the doors 10 are normally located in a single plane when disposed in the closed position thereof so as to form a fixed wall, the portions of the track assemblies 12 and 14 that are located in the entrance area are formed in elongated straight sections. One of the track sections is illustrated in section in FIG. 3 and is representative of the straight track sections that are mounted in the floor and upper support for guiding the doors 10 to and from the open and closed position thereof. The track section shown in FIG. 3 is generally indicated at 108 and is cast or extruded in an integral construction to define side walls 109, a bottom wall 111 and a top wall in which parallel grooves or tracks 110 and 112 are formed. The portion of the upper surface of the track section 108 that is located between the spaced tracks 110 and 112 defines a surface 114 on which the guide member rollers are received. A central groove 115 is formed in the track section 108 between the tracks 110, 112 and receives a nut 116 therein, a screw 118 engaging the nut 16 for securing a mounting element 120 to the track section 08. The mounting element 120 and track section 108 are fixed in a floor 122 in any suitable manner, it being understood that the upper surface of the track section 108 is flush with the surface of the fioor. With the track section 108 of the track assemblies 12 and 14 fixed in the floor and upper support as illustrated, the doors 10 are suitably mounted therebetween by first locating the guide tab 72 and 74 in the tracks 112 and 110, respectively, of the lower track assembly, the rollers 68 being received on the surface 114. It is further understood that the upper guide tabs 106 located in the upper ends of the vertical members 16 and 18 are received and guided in the tracks of the track assembly 12 in the same manner as just described. The doors 10 are thus moved between the track assemblies 12 and 14, the rollers 68 and 102 sup porting the doors while the guide tabs 72, 74 and 106 guide the doors in the tracks 110, 112 during rolling movement thereof. The guide assemblies defined -by the rollers 68 and 102 and the guide tabs 72, 74 and 106 thus support and guide all four corners of the door and further provide for control of the four corners. By providing the four corner control through the use of the spring loaded guide assemblies, the doors are locked between the track assemblies 12 and 14 and can only be removed therefrom by first removing a track section of the upper track assembly 12.

One of the novel features of the invention is the movement of the doors 10 from the closed position to a storage position whereby the doors are located in a stacking arrangement. In this connection, reference is first made to FIG. 4 where one form of a storage area is illustrated. In the form of the invention illustrated in FIG. 4, the doors 10 are designed to be stacked in spaced parallel relation and in parallel position with respect to the normal use thereof. In order to stack the doors 10 in the manner indicated, a first switch member generally indicated at 122 is provided and cooperates with a second switch member generally indicated at 124 to guide the doors to the stacked or storage position thereof. The switch members 122 and 124 are preferably cast in a one-piece construction and are formed with grooved tracks of the type shown in FIG. 3. The switch member 122 is thus formed with a straight groove or track 126 that communicates with the track formed in the adjacent straight track section 108. The track 126 formed in the switch member 122 is thus a continuation of the track 110 and will receive and guide a guide tab 74 therein of the guide member that is located in the vertical member 16 which defines the leading end of the door 10 when it is moved to the storage position. Also formed in the switch member 122 is a curved groove or track 128 that communicates with the track 112 formed in the straight tr-ack section 108. The angle defined by the curvature of the track 128 is preferably 60, this angle providing for location of the door 10 in the required manner in the storage position without tilting and without mechanical attachments. A straight, end track section generally indicated at 130 is located adjacent to the switch member 122 and includes a groove or track 132 that communicates with the track 128. A parallel track is also formed in the track section 130 but is only a dummy track and is not employed for receiving a guide tab in the position of use of the track section 130 in the storage area. Although not shown, the track section 130 is formed with an end stop or bumper that limits the travel of the end door. It is also contemplated that the bumpers be removable for removing the doors as required.

Interposed between the switch member 122 and the switch member 124 is an intermediate track section generally indicated at 134 that includes a grooved track 136 and a parallel dummy track 137. The track 136 communicates with the track 126 and defines an extension of the track 126 and the track 110. As will be apparent hereinafter, the length of the track section 134 is such as to locate the switch member 124 that distance that is defined by the distance between the center lines of the leading and trailing guide tabs mounted in the vertical members 16 and 18. Located adjacent to the track section 134 in abutting relation thereto is the switch member 124 which is formed with a grooved track 138, the grooved track communicating with the grooved track 136. The grooved track 138 is also curved in the same manner as the track 128, that is to say, the curvature of the track 138 defines a 60 angle. It is seen that the tracks 128 and 138 are substantially parallel in the curvature thereof and will guide the guide tabs moving therein along parallel lines. An end track section 140 is located adjacent to the end of the switch member 124 and includes a grooved track 142 that communicates with the track 138. The track section 140, as seen in FIG. 4, is disposed in spaced parallel relation with respect to the track section 130 and may include a bumper or stop for limiting travel of the endmost door or for permitting installation or removal of the doors on and from the track section 140. It is further seen that the movement of the doors through the switch section is facilitated by locating the center line of the track sections 108, 130, 134 and 140 in alignment with the center line of the rollers 68 and 102.

In movement of the doors 10 from the closed position to the open or storage position, each of the doors is moved along the track assemblies 12 and 14, the guide tabs of each guide member being urged outwardly for engagement in its respective groove or track, and the rollers of each guide member riding on the wall between the tracks to provide four corner control for each door. As described hereinafter, reference is made to the operation of the lower guide assemblies as they are received in the switch sections 122 and 124, it being understood that the corresponding upper guide assemblies 106 will be received in the upper switch assemblies 122 and 124 in a similar manner. As the leading guide tab 74 of a door 10 approaches the switch member 122, it will follow in the track 126 thereof and in track 136 of the track section 134 in a straight line and without deviation. As the leading guide tab 74 reaches the switch member 124, the trailing guide tab 72 reaches the switch member 122. Thus, it is seen that the spacing of the switch members 122 and 124 must conform to the spacing between the leading and trailing guide tabs. The leading guide tab 74 is guided into the curved track 138 of the switch member 124, and simultaneously the guide tab 72 is guided into the curved track 128. The door is thus moved from the position that is aligned between the top and bottom straight track sections toward the track sections 130 and 140, the guide tabs 72 and 74 following tracks 132 and 142 formed therein. The first door to be stacked is thus moved to the position illustrated in dotted lines in FIG. 4, which is the endmost point of the track sections 130 and 140. As each succeeding door is moved from the straight track sections in the entrance area to the storage area, the rotatable guide members mounted therein will cause the doors to follow the curved tracks 128 and 138 in the switch members 122 and 124 until all the doors are disposed in the storage position. In this storage position, the doors are located in spaced parallel relation. It is understood that any number of doors can be stored in the storage area, the length of the end tracks 130 and 140 determining the number of doors to be stored. It is also understood that in movement of the doors 10 through the switch members 122 and 124, the movement thereof is achieved as a result of the rotatably mounted guide members 55 of which the guide tabs 72 and 74 form a part in their respective guide members. Thus, the guide tabs 72 and 74 are rotated to conform to the configuration of the curved tracks 128 and 138 as the doors move into the storage area.

Referring now to FIG. 5, a modified form of the storage area is illustrated, although the switch members 122- and 124 as illustrated therein are substantially identical in construction to the switch members illustrated in FIG. 4. In FIG. 5, the doors are adapted to be stored in a position whereby they are disposed at right angles with respect to the normal position they occupy when located in an entranceway. A straight track section 108, as illustrated in FIG. 4 and described in connection with FIG. 3, is shown in FIG. 5 as forming a part of the track assembly disposed in the entranceway. In order to move the doors into the storage area whereby they are located at right angles with respect to the position of use thereof, a curved track section generally indicated at 144 is employed. The curved track section includes grooved tracks 146 and 148 that communicate with the tracks 110 and 112, respectively. The curved track section 144 defines an angle of 90 and thus moves the doors through this angle so that they are moved into the storage area at right angles with respect to the normal position of use. As each of the doors moves to the storage area, the guide tabs thereof slide into the grooves 128 and 138 of the switch members 122 and 124, respectively; and the doors are thus moved to the storage position wherein they are located in spaced parallel relation. It is understood that an intermediate track section is located between the switch members 122 and 124 as seen in FIG. 5, and the end track sections 130' and 140 are employed therewith as illustrated and described above in FIG. 4. The length of the end track sections 130, 140 will, of course, be dependent upon the number of doors to be stored.

If the doors are to be stored in an area remote from the entrance area, they may be transferred over any length of track sections and moved in the required direction by utilizing curved track sections such as section 144. The direction of movement can be changed as desired by forming the right angle track sections either left or right hand depending upon the location of the storage area.

While there is shown and described herein certain specific structure embodying the invention, it will be manifest to those skilled in the art that various modifications and rearrangements of the parts may be made without departing from the spirit and scope of the underlying inventive concept and that the same is not limited to the particular forms herein shown and described except insofar as indicated by the scope of the appended claims.

What is claimed is:

1. In a sliding door construction, a door mounted for sliding movement between an upper support and a floor, an upper track assembly fixed to said upper support and a lower track assembly fixed to said fioor, each of said track assemblies having a continuous slot formed therein defining a track, clip portions located in said door at the upper and lower ends thereof, an externally threaded bushing threadably received in each clip portion and having a bore formed therethrough, a guide member mounted in each bushing for rotation therein, and including a body portion, a shaft fixed to said body portion and extending through the bore of the bushing, means fixed to the upper end of said shaft and engaging the upper end of a bushing for locking said shaft therein, a roller mounted on said body portion and engaging a guide surface of a track assembly for movement thereon, a guide tab joined to said body portion and projecting outwardly beyond said roller into a track, each of said clip portions having an opening formed therein that communicates with said externally threaded bushing, a spring located in each clip portion and engaging the upper end of the shaft that extends through the bore of the bushing mounted therein, wherein the spring positively urges the roller mounted in the body portion to which the shaft is joined outwardly of the end of the door and into positive engagement with said guide surface of the adjacent track assembly, and openings formed in the door that communicate with the openings in said clip portions to provide external access to the bushings mounted therein, wherein each of the bushings is adjustable vertically to vertically adjust the position of the associated guide tab and roller relative to the adjacent tracks and guide surface and without removal of the door from the tracks in said track assemblies.

2. In a sliding door construction as set forth in claim 1, a plurality of said doors mounted for sliding movement in a single plane between said upper support and floor, each of said upper track assemblies having a second track formed therein that is located in spaced parallel relation with respect to the first named track, each track in the lower track assembly being located in vertical alignment with a track in the upper track assembly, the guide members that are located in a clip portion in each door being disposed at the upper and lower ends thereof and adjacent to the leading edge of each door with respect to the movement of the doors toward a storage position, said guide members being further disposed at the upper and lower ends of each door and adjacent to the trailing edge thereof, the guide tabs of the guide members located adjacent to the trailing edge of each door being received in vertically aligned tracks of said upper and lower track assemblies, and the guide tabs of the guide members of each door located adjacent to the trailing edge thereof being received in the other vertically aligned tracks of said upper and lower track assemblies.

3. In a sliding door construction as set forth in claim 2, said upper and lower track assemblies including switch sections that provide for movement of said doors from the single plane position to a storage position, wherein the doors are disposed in spaced, parallel relation, each of said guide members being rotatable in the associated bushing so as to follow the tracks in said track assemblies, thereby providing for movement of said doors from the single plane position to the storage position.

4. In a sliding door construction as set forth in claim 3, both the upper and lower track assemblies including linear track sections that provide for the single plane position of the doors, each of said switch sections including only a fixed curved track that communicates with a track in the adjacent linear section, the curved track in one of said switch sections receiving the guide tabs located adjacent to the leading edge of each door and the curved track in another of said switch sections receiving the guide ta'bs located adjacent to the trailing edge of each door.

5. In a sliding door construction as set forth in claim 1, each of said doors including spaced vertical members that define side stiles and to which are joined upper and lower horizontal rail members, a clip portion and a guide member located in the upper and lower end of the vertical members to provide four-corner control for said door as the guide tab of each guide member is received in the tracks of said track assemblies, the openings in said door that communicate with the openings in said clip portions being formed in said vertical stiles adjacent to the ends thereof.

References Cited UNITED STATES PATENTS KENNETH DOWNEY, Primary Examiner. 

